JPH0355224B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method in which a long beam and a pipe to be welded are moved relative to each other in the longitudinal direction while a guide ring disposed at the free end of the long beam is engaged with a groove in the pipe to be welded. This invention relates to a vertical joint welding device for moving pipes for welding.

Generally, when longitudinally welding the inner surface of a pipe-shaped pipe to be welded, the welding operation is performed by inserting the free end of a long beam into the pipe to be welded. For this reason,
A long beam becomes longer in proportion to the length of the pipe to be welded, but the longer the long beam becomes, the greater the mechanical strength of the long beam itself must be. The minimum inner diameter was limited to a relatively large value.

In order to cope with this, conventionally, for example, a plurality of idler wheels have been provided on a long beam. That is, the first
In the figures to FIG. 3, a self-propelled truck 1' is placed on a rail 2' laid approximately parallel to the axis of the pipe to be welded 14, and the rear end of a long beam 3' is mounted on the self-propelled truck 1'. The parts are connected. A plurality of idlers 12', 12', . . . are arranged on the long beam 3', and these idlers 12', 12', . A guide ring 11 disposed at the tip of the long beam 3' engages in the groove of the pipe to be welded 14. From the state shown in FIG. 1, for example, while the self-propelled truck 1' is traveling in the _X2 direction, the welding head 8 is performing vertical joint welding of the pipes 14 to be welded. In this case, the pipe to be welded 14
Since the idler wheels 12' separated from the rail sequentially contact the guide surface 131' of the rail, the idler wheels 12', 12',
... always comes into contact with the inner surface of the pipe to be welded 14 or the guide surface 131' of the rail 2', and therefore the weight of the long beam 3', welding head 8, etc. , . . ., the long beam 3' can be made smaller, which has the advantage that small-diameter tubes to be welded can be welded.

By the way, in the case of a pipe to be welded, for example, a circular pipe, circular pipes having various wall thicknesses are generally manufactured for a single pipe outer diameter. However, in the conventional apparatus shown in FIGS. 1 to 3, the idler wheels 12',
12',... move and sequentially transfer to and contact the inner surface of the pipe to be welded 14 and the guide surface 131' of the rail 2'. It was necessary to make appropriate adjustments so that the guide surface of the guide surface accurately corresponds with the vertical direction.
In this case, the rail 2' becomes longer according to the length of the welded pipe 14, and as the welded pipe becomes longer, the welded pipe and rail become heavier, so the inner surface of the welded pipe and the rail are guided. It was extremely difficult to adjust the surfaces to be flush with each other in the vertical direction.

SUMMARY OF THE INVENTION An object of the present invention is to provide a longitudinal pipe welding apparatus that eliminates the above-mentioned conventional drawbacks.

Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

In FIGS. 4 and 5, 1 is a running trolley with a drive machine that runs on linearly arranged guide rails 2, and 3 is a long beam. For example, this long beam 3 extends in the X direction. Separated 1st and 2nd
It is composed of long beams 4 and 5, and a first pin 6 that pivotally supports the first and second long beams 4 and 5. The base of this elongated beam 3 is connected to the traveling truck 1. In the case shown, the second pin 7
It is supported by A welding head 8 is composed of, for example, a welding torch 9 and a torch adjustment device 10. Reference numeral 11 denotes a guide wheel rotatably supported at the free end of the long beam 3;
is formed so as to be able to engage with the groove 141 of the pipe to be welded 14 as in the conventional case.

Reference numeral 12 denotes an idler wheel rotatably disposed at the intermediate portion of the long beam 3. In the case shown in the figure, first and second idlers 121, 122 are attached to the tip of the first long beam 4. They are spaced apart in the longitudinal direction of the beam 3. 13, 13, ... are a plurality of receiving rail mechanisms arranged in the X direction, and each receiving rail mechanism 13
The receiving rail 131 and the receiving rail 131 are Z
It is composed of a support mechanism 132 that movably supports the receiving rail 131 in the Z direction, a driver (not shown) that moves the receiving rail 131 in the Z direction, and a stopper (not shown) that can adjust the position of the receiving rail 131 in the _Z direction as appropriate. There is.

These respective receiving rail mechanisms 13 move the respective rails 131, 1 when the receiving rails 131 are moved in the _Z2 direction by respective driving machines (not shown).
The respective stoppers (not shown) are adjusted so that the upper surfaces of 31, . . . are flush with each other. Also,
The receiving rail 13 is driven by each drive machine (not shown).
1, 131 in the _Z1 direction, that is, in the retracted position, the respective receiving rail mechanisms 13, 13,
... is located below the bottom surface of the traveling truck 1, so why does this hinder the traveling of the traveling truck 1? 1
Reference numeral 4 designates a pipe to be welded, such as a circular pipe or a square pipe, having a groove 141 similar to the conventional one, and in the illustrated case, it is a circular pipe. Reference numeral 15 denotes an end tab in which a groove 151 similar to the groove 141 of the pipe to be welded 14 is formed.
The tube to be welded 14 is supported and positioned by suitable support devices, such as a turning roll device and a conveyor roll device. In the illustrated case, the pipe to be welded is supported by, for example, conveyor roll devices 16, 16, . . . .

Next, the operation of the present invention will be explained.

4 to 7, first, as shown in FIG. 4, the traveling carriage 1 is positioned at the end in the _X2 direction, ie, in a so-called retracted state. In this case, as shown in the figure, the respective receiving rail mechanisms 13,
13,... are the respective receiving rails 131, 131,...
is raised in the _Z2 direction, and each receiving rail 13
1, 131, . . . and the end tabs 15 are positioned so that their upper surfaces are flush with each other.

From this state, the traveling trolley 1 is driven in the _X1 direction,
Along with this, the idler wheels 121, 122 move in the _X1 direction while sequentially rolling on the adjacent receiving rails 131, 131, . While the traveling trolley 1 is running,
As shown in FIG. 6, the receiving rail mechanisms 13, 13, . Therefore, despite the receiving rail mechanisms 13, 13,... being provided, the traveling bogie 1 continues to move.
X Drive in _one direction. In this case, the long beam 3
After passing through the groove 151 of the end tab 15, the guide ring 11 disposed at the free end of the guide ring 11 is inserted into the groove 141 of the pipe to be welded 14 and rolls in the _X1 direction.
As shown in FIG. 7, the traveling carriage 1 stops with the welding torch 9 positioned above the end of the welded part in the _X1 direction.

Thereafter, the groove 141 of the pipe to be welded 14 is welded by the welding torch 9 while the traveling truck 1 travels in the _X2 direction. As the welding progresses, the guide wheel 11 and idler wheels 121, 122 are also rolled in the _X2 direction.
After the end tab 15 and the traveling trolley 1 are appropriately spaced apart in the X direction, the idler wheel ₁₂₂
Before reaching the end in the _X1 direction, one or more receiving rails 131 located in the
Even if it rolls in the _X2 direction beyond 5, the idler wheel 121,
122 is supported by the upper surface of the receiving rail 131. Therefore, even if the idlers 121, 122 are located within the grooves 141, 151, or on the upper surface of the receiving rails 131, 131, the vertical positions of the idlers 121, 122 are approximately the same. will be maintained. Note that when the receiving rail 131 located on the _X1 direction side is moved up, the receiving rails 131, 131, . . . adjacently provided on the _X2 direction side are sequentially moved up.

After this, as shown in FIG.
is supported on the upper surface of the receiving rail 131,
The traveling trolley 1 traveling in the X _two directions is stopped and a series of welding operations is completed. Generally, the end tab 15 is provided so that the end of the pipe to be welded is welded in the same way as other welding parts, and the welding result of the end tab 15 itself is not given much importance, so the welding torch 9 is used. The actual end point of welding can be appropriately selected as long as it is after the point in time when the welding torch 9 is positioned above the end tab 15. For this reason, the length of the end tab 15 is usually formed to be longer than the distance between the welding torch 9 and the guide ring 11.

After the above welding work is completed, the pipe to be welded 14 is replaced and the next welding work is performed.

When the welded pipe 14 is replaced, the welded pipe 14
When the inner states of the guide wheels ₁₁ and
After the carriage 1 is run in the X ₁ direction or the X ₂ direction so as to be separated from the receiving rail 131 located at the end of the X ₁ direction, the upper surface of the receiving rail 131 located at the end of the X 1 direction A stopper (not shown) of the receiving rail mechanism 13 is operated so that it is flush with the inner surface of the receiving rail 13, and then the positions of the adjacent receiving rails 131, 131, . . . are sequentially adjusted. When adjusting the position of each receiving rail 131, the position of each receiving rail 131 is adjusted in order to appropriately select the position of the traveling bogie 1 so that the guide wheels 11 and idler wheels 12 are not located on the receiving rail 131. It can be done easily and quickly. In addition, multiple sets of receiving rail mechanisms that can be raised and lowered are arranged in the long axis direction of the long beam, and when the traveling truck approaches, the receiving rails are lowered, so the traveling truck can reach the pipe to be welded without any hindrance. can be as close as possible to the target. Therefore, the length of the long beam can be made relatively short. Furthermore, when the idler wheel moves over the pipe to be welded in the direction of the end tab, the receiving rail mechanism is activated so that the receiving rail moves up by the time the idler wheel passes the end tab. We are always supported by cooperation with. For this reason, the long beam is supported at at least three points, making it possible to create a long beam with a small moment of inertia.Also, the long beam is always maintained in a constant state, ensuring uniform welding results. Obtainable. In addition, if two or more idlers are arranged apart in the long axis direction of the long beam and the distance between the idlers is different from the effective receiving length of the receiving rail that goes up and down, one of the idlers Even when the other idler wheel is located at the joint of the receiving rail, the other idler wheel is supported by the flat surface of the receiving rail, so even if there is a gap at the joint between the receiving rails, the idler wheel moves smoothly on the receiving rail. . Therefore, by arranging two or more idlers apart in the long axis direction of the long beam, it is possible to allow gaps between the respective receiving rails, making it easier to install multiple sets of receiving rail mechanisms. can be done. Furthermore, the long beam is divided into two or more pieces in the long axis direction, and each long beam is pivoted so as to be movable relative to each other within a vertical plane including the long axis of the long beam, and the parts near the pivot support are Providing an idler wheel on at least one of the long beams makes it easy to manufacture the long beams. That is, in general, in order to ensure that the long beam is in a horizontal state when it is installed, a so-called reverse distortion is applied in advance to the long beam so that it curves upward when the long beam is manufactured. By the way, as shown in Fig. 4, when manufacturing a single long beam that is supported at three points, it is difficult to manufacture it because it is necessary to give a reverse strain in the shape of a double mountain. If a long beam is divided into two or more pieces, each of which is relatively short, it is easy to handle, so it is easy to manufacture a long beam, and each long beam can be made without the usual reverse distortion of upward curving. Since it is only necessary to provide the beams, it is easy to manufacture each long beam.

In the above, the idler wheel 12 is the groove 1 of the pipe to be welded.
41 or above the groove 141. The idler wheel 12 may be a commonly used rolling wheel, or may be constructed of a sphere and a spherical bearing. Furthermore, the long beam 3 near the guide wheel 11
A support roll mechanism that can move up and down freely in the Z ₁ and Z ₂ directions is provided with a sphere and a spherical bearing, and when the long beam 3 and the pipe to be welded 14 move in the longitudinal direction, the sphere of the support roll mechanism is moved to the guide ring. The groove 14 of the guide ring 11 and the pipe to be welded 14 is positioned in the Z ₁ direction from the guide ring 11.
1, and the sphere of the support roll mechanism can be positioned in the _Z2 direction relative to the guide wheel 11 during welding, so that the guide wheel 11 and the groove 141 can be engaged with each other. Furthermore, during welding work, it is sufficient that the pipe to be welded and the traveling cart move relative to each other in the longitudinal direction, but when moving the pipe to be welded in the longitudinal direction, the heavy pipe to be welded is moved at a constant speed during welding. Therefore, it is preferable to keep the pipe to be welded fixed and move the long beam and traveling truck. In this case, the actual welding direction is arbitrary, but if the traveling state is when the traveling trolley approaches the pipe to be welded, and the actual welding state is when the traveling trolley is moving away from the pipe to be welded, then the actual welding direction is Since the traveling truck, idler wheels, etc. are in a so-called retracted state at the time of completion, there is no risk that the idler wheels, guide wheels, etc. will come into contact with the red-hot part after welding and be damaged. Despite this, the actual welding work can be carried out when the traveling truck approaches the pipe to be welded, but in this case, the position of the welding torch and guide wheel arranged at the free end of the long beam Of course, is replaced. Furthermore, if a groove is formed on the upper surface of the receiving rail disposed at the end of the receiving rail mechanism in the _X1 direction to engage with the guide ring, it is possible to It is possible to reduce vertical positional fluctuations when the vehicle is located at Of course, in order to weld uniformly over the entire length of the pipe to be welded, it is preferable to provide entrant doves at both ends of the pipe to be welded. In addition, in the receiving rail mechanism, if the support mechanism that supports the receiving rail so that it can be raised and lowered is made into a so-called pantograph shape as shown in the figure, the space required in the vertical direction when the receiving rail is lowered can be reduced. Nevertheless, as a support mechanism for the receiving rail, it is possible to adopt a structure having an appropriate structure, for example, a mechanism in which the receiving rail is supported by a guide bar so as to be movable up and down.

As described above, according to the first invention, the guide wheel and the idler wheel disposed on the long beam are always supported by one or both of the receiving rail and the pipe to be welded. During relative movement welding with the welding tube, the elongated beam is maintained in a constant state, ensuring uniform welding results.
Furthermore, multiple sets of receiving rail mechanisms that can be raised and lowered are arranged in the long axis direction of the long beam, making it easy and quick to adjust the vertical position of the receiving rails in response to changes in the inner surface condition of the pipe to be welded. be able to. Furthermore, since the long beam is supported at at least three points, it can be applied to pipes to be welded with as small a diameter as possible, and it can be disposed over a length longer than the distance between the guide wheel and the idler wheel. The installed multiple sets of receiving rail mechanisms, each of which can be raised and lowered, move the receiving rails appropriately to the retracted position when the pipe to be welded approaches the base of the long beam. The welded pipe can be placed as close as possible, and therefore the length of the long beam can be made relatively short.

Furthermore, according to the second invention, in addition to the effects of the first invention, the long beam can be divided into two or more pieces in the longitudinal direction, so the long beam can be easily and inexpensively manufactured. This is industrially advantageous since it is possible to provide an inexpensive welding device.

[Brief explanation of drawings]

FIG. 1 is a front sectional view showing a conventional example, FIGS. 2 and 3 are sectional views taken along lines - and -, respectively, in FIG. 1, and FIG. 4 is a front view showing an embodiment of the present invention.
5 is a plan view of FIG. 4, and FIGS. 6 and 7 are explanatory views of the operation of the apparatus shown in FIG. 4, respectively. 1... Traveling trolley, 2... Guide rail, 3...
Long beam, 8... welding head, 11... guide wheel, 12... idler wheel, 13... receiving rail mechanism,
131... Receiving rail, 14... Pipe to be welded, 14
1...Bevel.

Claims (1)

[Scope of Claims] 1. A pipe to be welded by relatively moving the pipe to be welded and a long beam having a guide ring and a welding head disposed at the free end of the pipe to engage with the groove of the pipe to be welded in the longitudinal direction. In the vertical joint welding device, one or more idlers are arranged in the middle part of the long beam, and one or more idlers are arranged on the long beam side of the pipe to be welded, when the pipe to be welded approaches the base of the long beam. A pipe comprising a plurality of sets of receiving rail mechanisms for locking idlers, each of which can be raised and lowered and lowered to a retracted position as appropriate, for a length equal to or longer than the distance between the guide wheel and the idler wheel. Vertical welding equipment. 2. The idler wheel is comprised of two or more idler wheels spaced apart from each other in the longitudinal direction of the long beam.
Vertical joint welding equipment for pipes as described in . 3. In a vertical joint welding device for pipes in which a long beam having a guide ring that engages with the groove of the pipe to be welded and a welding head arranged at the free end and the pipe to be welded are welded by moving relative to each other in the longitudinal direction , the long beam is divided into two or more pieces in the axial direction, and each long beam is pivoted so as to be movable relative to each other within a vertical plane including the long axis of the long beam, and at least one of the long beams near the pivot support is An idler wheel is disposed on one of the long beams, and on the long beam side of the pipe to be welded, the wheels are movable up and down, and are lowered to a retracted position appropriately when the pipe to be welded approaches the base of the long beam. A longitudinal pipe welding device comprising a plurality of sets of receiving rail mechanisms for locking idlers, arranged over a length equal to or longer than the distance between the guide wheel and the idler wheel. 4. The idler wheel is comprised of two or more idler wheels spaced apart from each other in the longitudinal direction of the long beam.
Vertical joint welding equipment for pipes as described in .